It depends on many things. Such as which Monarch, which Countries, and which parts of the world. As a whole though several treds have emerged.
Western Europe
From the Atlanic Ocean to basically the River Dnieper and North of Byzantium was Catholic Europe. In general the Church had absolute authority in this region during much of the Middle Ages. There were times when the leaders (The Holy Roman Empire was often most guilty) would pay less heed to the Church, but the Church and the Papal States remained vastly powerful. For much of Medieval Europe the Church was everything, this even translated to the Monarchs, often styled with something to the effect of "By the Grace of God", meaning that the Kings all felt that they were only in their station because God allowed it. This means that the Pope, the single most powerful human in the Church carried much power over the Monarchs. It was because of this that there were the Crusades in the Holy Land.
Eastern Europe
In Eastern Europe the Orthodox Church had less power than the Catholic Church. Part of it is that the Orthodox Church is not as heirachical as the Catholic Church and by that nature it has less power behind it. Additionally parts of Eastern Europe remained pagan well into the later middle ages. Lithuania was the last to convert, and in-fact it took until the 17th Century for Lithuania to fully embrace Christianity. And for a pagan nation, the Church means absolutely nothing.
the selection of Church officials.
the Preist is the most important.
The most important musicians during the Middle Ages were priests and those who worked for the church.
In the Middle Ages, royalty had access to aspects of the Church to which the peasants did not have. For example, many monarchs had a priest who acted as the monarch's personal confessor.
The Magna Carta contributed the the growing of the church in the Middle Ages.
the selection of Church officials.
The most important musicians during the Middle Ages were priests and those who worked for the church.
the Preist is the most important.
It was the center of growth in the Christian church.
promoted trade
The church constantly threatened the monarchy with excommunication when they went against the church. In the Middle Ages excommunication was a real threat to people because they believed that they would go to Hell if they didn't follow the church.
In the Middle Ages, royalty had access to aspects of the Church to which the peasants did not have. For example, many monarchs had a priest who acted as the monarch's personal confessor.
it probaly was. because i have seen middle age sheilds with crosses.
The Catholic church was the "state" and ruled the society of the middle ages.
The only church in the Middle Ages was the Catholic Church. I am not sure what the question is asking about the church.
yea
The Magna Carta contributed the the growing of the church in the Middle Ages.